Radio coupling coil



May 19,1931 T. J. SCOFIELD ET AL RADIO COUPLING COIL Filed Oct. 30., 1929 Theodore ffco/z'e/d Georye #49276 and Jose flf/ammand g INVENTOR B ATTORNEY Patented May 19, 1931 UNITED STATES PATENT OFFICE,

THEODORE JOHNSON soormnn, GEORGE ALFRED wnrrn, AND, 105 DAYTON HAMMOND, or JACKSON, MICHIGAN, ASSIGNORS TO THE SPARKS-WITHINGTON COMPANY, A CORPORATION OF OHIO RADIO oonrrme COIL This invention relates to spools orother forms for receiving coils of transformers, 1nductances or resistances.

An object of the invention is to construct a coil support having provision for securing the ends in permanent-fashion with minimum exposed parts. 0

Other objects will appear in the following description, reference being had to the drawings, in which:

Fig. 1 is an end view of the COll support or spool.

Fig. 2 is a side view of the spool shown in Fi 1.

ig. 3 is an end view of the spool shown in Fig. 2 with the coil wound in posltlon and the ends fastened to the terminal posts.

Fig. 4: is a plan view of the terminal clip shown in Fig. 3 before it is bent into final form.

Fig. 5 is an edge view of the terminal cl p.

In radio receiving sets the electrical 00118 and inductances must be wound on supports that have minimum dielectric losses. These coil supports are usually made of fibre but we have found that well seasoned and treated wood is an excellent medium for making these coil supports and the drawings illustrate the use of this material, though, of course, the invention is not limited to the use of any particular material whatever.

In the drawings we have shown the spool as designed for receiving two coils. The spool therefore has three flanges, 1, 2 and 3 having transverse notches 5 and 8 sawed therein. Flange 1 has a peripheral groove 4. On the opposite sides of the cut 5 and in the groove 4. are formed holes 6 and 7 to receive pins to be referred to later. Flange 3 has a similar groove 7 formed therein. I-Ioles are also drilled on opposite sides of the cut 8 as in flange 1. Flange 2 acts as a spacing means between the two coils wound on the spool and no terminals are fastened thereto.

To form the coil on this spool the operator will place the spool in a machine so that it will be rotated. Wire will then be wound between flanges 1 and 2 and between flanges 2 and 3. When the appropriate amount of this wire has been wound in each ,space'the operator will string one terminalthrou h transversecut 5 and thence circumferentially along the short'space of the groove 4 and wind it around clip 11 which is secured to the flange by driving the pin 10 into the holes formed therein. The dowel pin may have threads of steep pitch to hold them in place. Barbs 11' on the clip grip the wood flange and prevent it from turning. The wire is soldered to the clip as indicated in the drawings at 12. The clip usually is bent into the shape shown in Fig. 3 so as to make it easy to attach a connecting wire thereto. The other end of the coil above referred to is then bent along the transverse cut 5 and thence into groove 4. This end is secured to its clip in the same way as described. The coil between flanges 2 and 7' has its end similarly fastened to clips 11 on opposite sides of the circumference. The clips may all be arranged on the same side of the spool or in any other relation, but it is preferable to arrange the clips on opposite sides. If desired,

insulating spaghetti may be used at 13 and 14 where the wires pass through out 5.

After the spool has been wound it may be attached to the supporting base of a. radio receiving set and the proper wires connected to the terminal plates same thereto.

Having described our invention, what we claim is:

1. In electric coils, a spool, a flange on said spool having a transverse notch, pins in said flange on each side of said notch, and a c011 wound on said spool adjacent the flange, the ends of said coil being secured to said pins.

2. In electric coils, a spool, flanges on said spool having transverse notches and circum- 11 by soldering the ferential grooves, coils on said spool between the flanges thereof and having ends passing through said notches, terminal clips secured to said ends and pins holding the clips to the I said flanges.

3. In electric coils, a spool, flanges on said spool having transverse notches and circumferential grooves, coils in said spool between the flanges thereof and having ends passing through said notches, terminal clips secured the one end of each of said clips to connect a wire terminal. 1

to said ends and pins holding said clips to the flanges on opposite sides of said notches.

' 4. In electric coils, a spool, flanges on said spool, each havinga groove in the periphery,

each of said flanges also having a transverse I notch, and radial holes on each sideof said notch, pins in said holes, conducting clips having barbs tightly clamped against said i 1 flanges by said pins, a' coilon said spool having ends soldered to said clips, and means on In testimony whereof, We have signed our names to this specification this 22nd day of Oetober, 1929.

THEODORE JOHNSON sco rmrn V 

